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Thread: Starting C-41

  1. #1
    markbarendt's Avatar
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    Starting C-41

    Okay, my search terms aren't getting me my answer.

    I have just got all my C-41 chemicals but I'm a bit confused so I'm going to write this out and hopefully have you all correct my processes before I screw up.

    I have the Trebla TL-50 FilmPAC and the separate starter. The volumes in the FilmPac are supposed to be proportional but the bottles don't indicate their actual volumes so my original thought that I would mix replenisher as I go seems unworkable now.

    It looks like I'm supposed to mix up the FilmPAC replenisher concentrate into a full ten liters of developer replenisher, what I will call "stock", all in one go. This stock would then be stored.

    Then to make the first batch of working developer I just add the right amounts of my replenisher stock, with my starter concentrate, and water to fill my working solution storage bottle, say 1.5 liters.

    For me 1.5 liters would be enough to fill any one of my small tanks and still have enough to spill a few drops.

    From this working solution bottle I could pour 300ml of the working developer into my single reel tank. (950ml for my 4 reel tank)

    While the working solution is in the developement tank doing it's thing to the film I could be adding the right amount of replenisher to my working solution storage, in this case 21ml. (84ml for 4 reels)

    When the timer tells me the film is done I'd then dump the used working solution back into the working solution bottle until full and dispose of the extra 21ml of used solution. (84ml for 4 reels)

    Here's my confusion/question though. Do I add more starter or was that a one shot forever thing?
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Ana´s Nin

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    glbeas's Avatar
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    First off what kind of volume are you doing? The developer will degrade rather quickly from oxidation after mixing the "replenisher" and you will either waste a bunch of developer or ruin some film with weak chemicals or both. Contact the manufacturer if possible to find out the proper ratios and find an inert gas source to purge the bottles of air before resealing them to prevent oxidation.
    Gary Beasley

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    markbarendt's Avatar
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    Hi Gary,

    Doing a few rolls a week and was hoping to mix as I go but...

    Okay, well let me ask this, is there data on the shelf life of 1/2 full bottles of concentrates?

    The only shelf life info I've found is for stock solution.
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Ana´s Nin

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    glbeas's Avatar
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    The shelf life is somewhat longer but it will fail pretty quick unless you flush the air from the bottles.
    Gary Beasley

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    markbarendt's Avatar
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    I wonder if anyone has tried the Mylar water bags, like in a box of wine.
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Ana´s Nin

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    I mix up small quantities of the developer, fix and stabilizer straight from the concentrates as I need them. For example, according to my notes the proportions for 1/3 liter are:

    Developer:
    - 266ml water
    - 21.3ml Part A
    - 3.5ml Part B
    - 4.9ml Part C
    Stir, then add
    - 8.3ml starter

    Fix:
    - 166.6ml water
    - 166.6ml fix

    Stabilizer:
    - 330ml water
    - 3.3ml stabilizer

    I dump these after one use.

    Since the bleach is not prone to going bad, I just mix 1 liter of it and then replenish at 5ml per roll of 24 exposures (or equivalent).

    My process is
    1) Warmup dry 6:00 at 38 deg C
    2) Develop 3:15 at 37.8 +/-0.15
    3) Bleach 1:00 at 38 +/-3
    4) Fix 2:00 at 38+/-3
    5) Wash 2:00 at 38 +/-3
    6) Stabilize 2:00 or so at 32-40 (in a separate dish, not in the developing tank)

  7. #7
    markbarendt's Avatar
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    Quote Originally Posted by Jerry Thirsty View Post
    I mix up small quantities of the developer, fix and stabilizer straight from the concentrates as I need them.
    Now we are cooking!

    Are you using the same kit?

    How long do your concentrates last?
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Ana´s Nin

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    stradibarrius's Avatar
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    I am trying to find a "kit" that have all the different chemicals for
    c-41 or a list of the chemicals needed that I can by separately.

    Gary could you give the list of the chemicals that you showed me when I came over to your darkroom.
    "Generalizations are made because they are generally true"
    Flicker http://www.flickr.com/photos/stradibarrius
    website: http://www.dudleyviolins.com
    Barry
    Monroe, GA

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    Quote Originally Posted by markbarendt View Post
    Now we are cooking!

    Are you using the same kit?

    How long do your concentrates last?
    Yes, I'm using the Trebla Filmpac. I don't know how long they last; I've only been using it for about 6 months. So far so good.

  10. #10
    markbarendt's Avatar
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    Quote Originally Posted by Jerry Thirsty View Post
    about 6 months. So far so good.
    That's very liveable.

    Two more questions and I think I'm done.

    Are you using the bottles it all came in?

    Are you using anything to displace the air?

    Thanks for the input Jerry!
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Ana´s Nin

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